S/M Torque Converter Mopar TF A-904 27-Spline

The Hughes Performance S/M Torque Converter for Mopar TF A-904 with 27-spline design (part number 27-30) is a street-performance transmission component engineered for vehicles equipped with the Torquflite A904 automatic gearbox. This 10-inch bolt circle converter features a 3000 RPM stall speed, placing it in the pro-street category—ideal for drivers seeking responsive off-the-line performance without the extreme stall characteristics of full drag-racing units. The 27-spline input shaft matches the A904 transmission's spline count, ensuring proper engagement and eliminating compatibility guesswork.

At 29.75 lbs and measuring 8.1 x 8.1 x 14.1 inches, this converter integrates into standard A904 installations with no frame or drivetrain modification. The 3000 RPM stall speed allows the engine to build torque before the transmission engages, improving acceleration feel during highway merging and light-throttle driving—a practical middle ground between stock converters (which stall at 1500–1800 RPM) and dedicated race units. Hughes Performance's design prioritizes durability in repeated street use, with internal components rated for the stress cycles of daily driving combined with periodic spirited acceleration.

This converter suits Mopar enthusiasts building or rebuilding A904-equipped vehicles—including muscle car restorations, street rods, and performance sedans where an automatic transmission is preferred or required. Buyers upgrading from a worn or high-mileage converter will notice sharper throttle response and more predictable launch characteristics. Installation requires basic transmission service knowledge or professional service; the unit bolts directly to the flexplate without additional adapters or modifications when properly matched to an A904 application.